Power Distribution Module: Description and Operation

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

System Description
- IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block which were originally placed in engine compartment. It controls integrated relays via IPDM E/R control circuits.
- IPDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control, etc.
- It controls operation of each electrical component via ECM, BCM and CAN communication lines.

CAUTION: None of the IPDM E/R integrated relays can be removed.

SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication lines, it receives signals from the BCM and controls the following lamps:
- Headlamps (Hi, Lo)
- Parking lamps
- Tail and license lamps
- Front fog lamps

2. Wiper control
Using CAN communication lines, it receives signals from the BCM and controls the front wipers.

3. Heated mirror relay control
Using CAN communication lines, it receives signals from the BCM and controls the heated mirror relay.

4. A/C compressor control
Using CAN communication lines, it receives signals from the ECM and controls the A/C compressor (magnetic clutch).

5. Starter control
Using CAN communication lines, it receives signals from the BCM and controls the starter relay.

6. Cooling fan control
Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.

7. Horn control
Using CAN communication lines, it receives signals from the BCM and controls the horn relay.

CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN H-line), it is possible to transmit a maximum amount of information with minimum wiring. Each control unit can transmit and receive data, and reads necessary information only.




1. Fail-safe control
- When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication returns to normal operation, it also returns to normal control.
- Operation of control parts by IPDM E/R during fail-safe mode is as shown:

IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by itself based on each operating condition.
1. CAN communication status
- CAN communication is normally performed with other control units.
- Individual unit control by IPDM E/R is normally performed.
- When sleep request signal is received from BCM, mode is switched to sleep waiting status.

2. Sleep waiting status
- Process to stop CAN communication is activated.
- All systems controlled by IPDM E/R are stopped. When 1 second has elapsed after CAN communication with other control units is stopped, mode switches to sleep status.

3. Sleep status
- IPDM E/R operates in low current-consumption mode.
- CAN communication is stopped.
- When a change in CAN communication signal is detected, mode switches to CAN communication status.
- When a change in ignition switch signal is detected, mode switches to CAN communication status.

CAN Communication System Description
Refer to LAN-4, "Information Bus". Description and Operation